diff options
Diffstat (limited to 'src/mame/video/tia.c')
-rw-r--r-- | src/mame/video/tia.c | 116 |
1 files changed, 58 insertions, 58 deletions
diff --git a/src/mame/video/tia.c b/src/mame/video/tia.c index f8258c98a46..131a8895df2 100644 --- a/src/mame/video/tia.c +++ b/src/mame/video/tia.c @@ -51,76 +51,76 @@ PALETTE_INIT_MEMBER(tia_ntsc_video_device, tia_ntsc) /******************************************************************** Atari 2600 NTSC Palette Notes: -Palette on a modern flat panel display (LCD, LED, Plasma, etc.) -appears different from a traditional CRT. The most outstanding -difference is Hue 1x, the hue begin point. Hue 1x looks very -'green' (~-60 to -45 degrees - depending on how poor or well it -handles the signal conversion and its calibration) on a modern +Palette on a modern flat panel display (LCD, LED, Plasma, etc.) +appears different from a traditional CRT. The most outstanding +difference is Hue 1x, the hue begin point. Hue 1x looks very +'green' (~-60 to -45 degrees - depending on how poor or well it +handles the signal conversion and its calibration) on a modern flat panel display, as opposed to 'gold' (~-33 degrees) on a CRT. -The official technical documents: "Television Interface Adaptor -[TIA] (Model 1A)", "Atari VCS POP Field Service Manual", and +The official technical documents: "Television Interface Adaptor +[TIA] (Model 1A)", "Atari VCS POP Field Service Manual", and "Stella Programmer's Guide" stipulate Hue 1x to be gold. -The system's pot adjustment manually manipulates the degree of -phase shift, while the system 'warming-up' will automatically -push whatever degrees has been manually set, higher. According -to the Atari VCS POP Field Service Manual and system diagnostic -and test (color) cart, instructions are provide to set the pot -adjustment having Hue 1x and Hue 15x (F$) match or within one +The system's pot adjustment manually manipulates the degree of +phase shift, while the system 'warming-up' will automatically +push whatever degrees has been manually set, higher. According +to the Atari VCS POP Field Service Manual and system diagnostic +and test (color) cart, instructions are provide to set the pot +adjustment having Hue 1x and Hue 15x (F$) match or within one shade of each other, both a 'goldenrod'. -At power on, the system's phase shift appears as low as ~23 -degrees and after a considerable consistent runtime, can be as -high as ~28 degrees. - -In general, the low end of ~23 degrees lasts for several seconds, -whereas higher values such as ~25-27 degrees are the most -dominant during system run time. 180 degrees colorburst takes -place at ~25.7 degrees (A near exact match of Hue 1x and 15x - -To the naked eye they appear to be the same). - -However, if the system is adjusted within the first several -minutes of running, the warm up, consistent system run time, -causes Hue 15x (F$) to become stronger/darker gold (More brown -then ultimately red-brown); as well as leans Hue 14x (E$) more -brown than green. Once achieving a phase shift of 27.7 degrees, -Hue 14x (E$) and Hue 15x (F$) near-exact match Hue 1x and 2x -respectively. - -Therefore, an ideal phase shift while accounting for properly -calibrating a system's color palette within the first several -minutes of it running via the pot adjustment, the reality of -shifting while warming up, as well as maintaining differences -between Hues 1x, 2x and 14x, 15x, would likely fall between 25.7 -and 27.7 degrees. Phase shifts 26.2 and 26.7 places Hue 15x/F$ -between Hue 1x and Hue 2x, having 26.2 degrees leaning closer to +At power on, the system's phase shift appears as low as ~23 +degrees and after a considerable consistent runtime, can be as +high as ~28 degrees. + +In general, the low end of ~23 degrees lasts for several seconds, +whereas higher values such as ~25-27 degrees are the most +dominant during system run time. 180 degrees colorburst takes +place at ~25.7 degrees (A near exact match of Hue 1x and 15x - +To the naked eye they appear to be the same). + +However, if the system is adjusted within the first several +minutes of running, the warm up, consistent system run time, +causes Hue 15x (F$) to become stronger/darker gold (More brown +then ultimately red-brown); as well as leans Hue 14x (E$) more +brown than green. Once achieving a phase shift of 27.7 degrees, +Hue 14x (E$) and Hue 15x (F$) near-exact match Hue 1x and 2x +respectively. + +Therefore, an ideal phase shift while accounting for properly +calibrating a system's color palette within the first several +minutes of it running via the pot adjustment, the reality of +shifting while warming up, as well as maintaining differences +between Hues 1x, 2x and 14x, 15x, would likely fall between 25.7 +and 27.7 degrees. Phase shifts 26.2 and 26.7 places Hue 15x/F$ +between Hue 1x and Hue 2x, having 26.2 degrees leaning closer to Hue 1x and 26.7 degrees leaning closer to Hue 2x. - -The above notion would also harmonize with what has been -documented within "Stella Programmer's Guide" for the colors of -1x, 2x, 14x, 15x on the 2600 and 7800. 1x = Gold, 2x = Orange, -14x (E$) = Orange-Green. 15x (F$) = Light Orange. Color -descriptions are best measured in the middle of the brightness -scale. It should be mentioned that Green-Yellow is referenced -at Hue 13x (D$), nowhere near Hue 1x. A Green-Yellow Hue 1x is -how the palette is manipulated and modified (in part) under a + +The above notion would also harmonize with what has been +documented within "Stella Programmer's Guide" for the colors of +1x, 2x, 14x, 15x on the 2600 and 7800. 1x = Gold, 2x = Orange, +14x (E$) = Orange-Green. 15x (F$) = Light Orange. Color +descriptions are best measured in the middle of the brightness +scale. It should be mentioned that Green-Yellow is referenced +at Hue 13x (D$), nowhere near Hue 1x. A Green-Yellow Hue 1x is +how the palette is manipulated and modified (in part) under a modern flat panel display. -Additionally, the blue to red (And consequently blue to green) -ratio proportions may appear different on a modern flat panel -display than a CRT in some instances for the Atari 2600 system. -Furthermore, you may have some variation of proportions even +Additionally, the blue to red (And consequently blue to green) +ratio proportions may appear different on a modern flat panel +display than a CRT in some instances for the Atari 2600 system. +Furthermore, you may have some variation of proportions even within the same display type. - -One side effect of this on the console's palette is that some -values of red may appear too pinkish - Too much blue to red. -This is not the same as a traditional tint-hue control adjustment; -rather, can be demonstrated by changing the blue ratio values + +One side effect of this on the console's palette is that some +values of red may appear too pinkish - Too much blue to red. +This is not the same as a traditional tint-hue control adjustment; +rather, can be demonstrated by changing the blue ratio values via MESS HLSL settings. -Lastly, the Atari 5200 & 7800 NTSC color palettes hold the same -hue structure order and have similar appearance differences that +Lastly, the Atari 5200 & 7800 NTSC color palettes hold the same +hue structure order and have similar appearance differences that are dependent upon display type. ********************************************************************/ /********************************* |